package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import com.itheima.reggie.utils.AliOSSUtils;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/*
 * 文件上传和下载
 * */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    //@Autowired  //注入阿里云OSS工具类
    //private AliOSSUtils aliOSSUtils;
    //
    ///**
    // * 阿里云 OSS 存储文件
    // */
    //@PostMapping("/upload")
    //public R<String> upload(MultipartFile file) {
    //    log.info("文件上传, 文件名:{}", file.getOriginalFilename());
    //    //调用阿里云OSS工具类实现上传
    //    try {
    //        String url = aliOSSUtils.upload(file);
    //        log.info("文件上传成功, 访问路径:{}", url);
    //        return R.success(url);
    //    } catch (IOException e) {
    //        e.printStackTrace();
    //        return R.error("上传失败");
    //    }
    //}

    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info("文件上传, 文件名:{}", file.getOriginalFilename());
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID生成唯一文件名
        String fileName = UUID.randomUUID().toString() + suffix;
        //创建一个目录对象
        File dir = new File(basePath);
        if (!dir.exists()) {
            //如果目录不存在，则创建目录
            dir.mkdirs();
        }
        try {
            //将文件保存到指定目录下
            file.transferTo(new File(basePath + fileName));
            log.info("文件上传成功, 访问路径:{}", basePath + fileName);
            return R.success(fileName);
        } catch (IOException e) {
            e.printStackTrace();
            return R.error("上传失败");
        }
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            // 输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出流，通过输出流写回浏览器，在浏览器显示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/png");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
